_timestamp format

Hi

I am trying to format my _timestamp to be in a human readable format

DELETE /twitter
PUT /twitter
PUT /twitter/tweet/_mapping
{ "tweet" :
{
"_timestamp" :
{ "enabled" : true, "store" : true, "format": "yyyy" }

}
}
PUT /twitter/tweet/1
{
"msg": "this is the tweet"
}
GET /twitter/_search
{
"fields": ["_timestamp", "_source"]
}

But it always appears as seconds since 1970

I can do something like this but that just overrides the contents of
_timestamp: what
I want to do is use the contents of _timestamp and format it.
DELETE /twitter
PUT /twitter
PUT /twitter/tweet/_mapping
{ "tweet" :
{
"_timestamp" :
{ "enabled" : true, "store" : true, "format": "yyyy" , "path": "d"},
"d": "date"

}
}
PUT /twitter/tweet/1
{
"msg": "this is the tweet",
"d": "2014"
}
GET /twitter/_search
{
"fields": ["_timestamp", "_source"]
}

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